Add Argo and k8s questions

Also updated Datadog questions.

topics/kubernetes/exercises/kustomize_common_labels/exercise.md

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+# Kustomize - Common Labels
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Kustomize binary installed
+
+## Objectives
+
+In the current directory there is an app composed of a Deployment and Service.
+
+1. Write a kustomization.yml file that will add to both the Service and Deployment the label "team-name: aces"
+2. Execute a kustomize command that will generate the customized k8s files with the label appended
+
+## Solution
+
+Click [here](solution.md) to view the solution